CAJ | 학술논문

以H3PO4、FeSO4·7H2O和LiOH·H2O为原料，石墨烯为碳源，采用水热合成法制备锂离子电池正极材料LiFePO4，考察水热反应温度和后期的焙烧温度等工艺条件对合成产物结构、形貌及电化学性能的影响。结果表明，水热反应温度和焙烧温度对合成的LiFePO4形貌结构与电化学性能均有显著的影响，石墨烯的掺入可明显改善材料的电化学性能。当水热温度为150℃、焙烧温度为700℃、石墨烯的掺入量为3%(质量分数)时，制备的样品具有相对较好的电化学性能，0.1C倍率下首次放电比容量为134.0 mA·h/g，经过20次循环后的比容量为131.3 mA·h/g，容量衰减率仅为2.02%。
이H3PO4、FeSO4·7H2O화LiOH·H2O위원료，석묵희위탄원，채용수열합성법제비리리자전지정겁재료LiFePO4，고찰수열반응온도화후기적배소온도등공예조건대합성산물결구、형모급전화학성능적영향。결과표명，수열반응온도화배소온도대합성적LiFePO4형모결구여전화학성능균유현저적영향，석묵희적참입가명현개선재료적전화학성능。당수열온도위150℃、배소온도위700℃、석묵희적참입량위3%(질량분수)시，제비적양품구유상대교호적전화학성능，0.1C배솔하수차방전비용량위134.0 mA·h/g，경과20차순배후적비용량위131.3 mA·h/g，용량쇠감솔부위2.02%。
LiFePO4 cathode material was synthesized using H3PO4, FeSO4·7H2O and LiOH·H2O as raw materials and graphene as carbon source. The effects of hydrothermal temperature and calcination temperature on the structure, micro-morphology and electrochemical performance of the as-synthesized specimens were investigated. The results show that both of hydrothermal temperature and calcination temperature are crucial parameters for the microstructure and electrochemical property of hydrothermal LiFePO4, the incorporation of graphene can significantly improve the electrochemical properties of the material. At the hydrothermal temperature of 150 ℃, the calcination temperature of 700 ℃ and the addition of graphene of about 3% (mass fraction), the as-obtained sample shows good electrochemical performance with initial specific discharge capacity of 134.0 mA·h/g at 0.1C, after 20 cycles, the specific capacity is 131.3 mA·h/g, and the decay rate is only about 2.02%.